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Horizontal Beams showing zero axial force when they should have non-zero value on application of lateral force on 2D Frame

Question:

I am modelling simple 2D frames for the purpose of analysing their structural response from Unit Lateral Load loads applied at the top of Frame. I have kept all connections as pinned to compare the interal forces with those from hand calculations. However, the horizontal members which have been modelled as beams in the frame are showing zero axial force (Fx) when there should be non-zero axial forces in the beams. Why is this so?
All members have been modelled as Beam elements

Answer:

Hi,

The zero axial forces in the horizontal members are caused by the story diaphragm. If you change it from 'Consider' to 'Do not consider', you can see non-zero axial forces.

Regards,

DK Lee

Creation date: 8/2/2018 12:16 PM Updated: 8/2/2018 9:47 PM

DataImage71.png

Axial Force[1].PNG

Leadenhall South Frame Original (On Site Sections).mgb

Leadenhall South Frame Original (On Site Sections) RIGID Connections.mgb

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	DataImage71.png 19 KB
	Axial Force[1].PNG 54 KB
	Leadenhall South Frame Original (On Site Sections).mgb 101 KB
	DataImage76.png 150 KB
	DataImage2.png 45 KB
	DataImage27.png 28 KB
	Model.PNG 25 KB
	Axial Force.PNG 39 KB
	Leadenhall South Frame Original (On Site Sections) RIGID Connections.mgb 104 KB